Estimated sweat loss during exercise

Sweat (L) ≈ pre-weight − post-weight (kg) + drink (L) − urine (L); rate = sweat / duration in hours. Weigh under matching conditions without wet clothing.

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Calculation

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This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.

Result

Sweat Rate
1.70 L/h

Individual fluid loss pace under current temperature and intensity conditions

Total Fluid Lost via Sweat
1700 mL
Body mass loss during exercise
1.6 %

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

Recommended Rehydration Volume
1200 – 1800 mL

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

How it is calculated

Sweat (L) ≈ pre-weight − post-weight (kg) + drink (L) − urine (L); rate = sweat / duration in hours. Weigh under matching conditions without wet clothing.

Formula

Sweat (L) ≈ pre-weight − post-weight (kg) + drink (L) − urine (L); rate = sweat / duration in hours. Weigh under matching conditions without wet clothing.

Limits of the method

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

Sources of the method

How to use the calculation

1

Enter the starting values

Sweat (L) ≈ pre-weight − post-weight (kg) + drink (L) − urine (L); rate = sweat / duration in hours. Weigh under matching conditions without wet clothing.

2

Adjust the parameters

Sweat Loss (mL) = (Pre_Weight − Post_Weight, g) + Fluid_Consumed(mL) − Urine(mL); Sweat Rate (L/h) = (Sweat Loss / Duration_min) × 60 / 1000; Dehydration % = ((Pre_Weight − Post_Weight) / Pre_Weight) × 100.

3

Read the result

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

Frequently asked questions

What does the calculation show?

Sweat (L) ≈ pre-weight − post-weight (kg) + drink (L) − urine (L); rate = sweat / duration in hours. Weigh under matching conditions without wet clothing.

What limitations apply?

Percentage body mass loss does not diagnose dehydration; a negative value indicates gain. NATA (2017): 100–150% of net body mass loss is a conditional postexercise replacement reference, especially with recovery under four hours. It is not a mandatory amount for everyone or an intake rate during exercise.

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